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Unix sed & awk commands in action

This extends sed and awk to write shell scripts for Java developers. sed & awk are very powerful tool for data engineers to transform text files. Here are a few …


Unix Sed commands for Java developers

sed (stream editor) is one of the powerful workhorse commands in UNIX. Recently I had to use it with “Git” and “Maven” to find text “SNAPSHOT” in …


Unix shell script to upload & download data between HDFS and edge node

In BigData projects relating to HDFS or AWS S3, it is common to have scripts that transfer or download data from HDFS to the local file system on an edge …


What does this Unix code snippet do?

Data Engineers & Java Developers must have a good handle on Unix. Most production systems are Linux based with 1000’s of scripts.

date

Q01. What does the below Unix code …


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300+ Big Data Interview Questions - FAQs

Big Data Interview FAQs - 300+
Big Data - 00a: Getting started
(7)
0: 25+ Big Data Engineering key concepts that Data Engineers must know
00: A roadmap to become a Big Data Engineer - What skills are required?
00: Data Lake Vs. Data Warehouse Vs. Data Lakehouse Vs Data Fabric Vs Data Mesh
01: Q01 - Q07 General Big Data, Data Science & Data Analytics Interview Q&As
02: Cleansing & pre-processing data in BigData & machine learning with Spark interview questions & answers
08: Q71 - Q75 ETL/ELT on BigData Interview Q&As
How would you go about.. building an ETL pipeline to handle 3k TPS (i.e transactions per second)
Big Data - 00b: Distributed
(12)
00: 13 Data modelling interview Q&As - Fact Vs Dimension, CDC, SCD, etc - part 1
00: Q1 - Q6 Hadoop based Big Data architecture & basics interview Q&As
01: Databricks interview questions & answers - overview
01: High level & low level system design considerations for read heavy systems
01: High level & low level system design considerations for write heavy systems
01: Lambda, Kappa & Delta Data Architectures Interview Q&As - Overview
01: Snowflake interview questions & answers - overview, components & architecture
02: Q7 - Q15 Hadoop overview & architecture interview Q&As
10 Distributed storage & computing systems interview Q&As - Big Data
16: Q114 - Q115 CAP theorem interview Q&As
Building idempotent data pipelines interview questions & answers
How would you go about.. building an ETL pipeline to handle 3k TPS (i.e transactions per second)
Big Data - 01: SQL
(48)
0: 20+ SQL best practices & optimisation interview Q&As
0: 50+ SQL scenarios based interview Q&As - What is wrong with this SQL code?
00: 50+ SQL scenarios based interview Q&As on identifying & deleting duplicate records
02: 50+ SQL scenarios based interview Q&As on joins, CDC and recursive CTE
02: SQL analytic functions interview questions - Part 1
02: SQL analytic functions interview questions - Part 2
02: SQL analytic functions interview questions - Part 3
03: 50+ SQL scenarios based interview Q&As on familiarising various features
04: 50+ SQL scenarios based interview Q&As on N<sup>th</sup> value
05: 50+ SQL scenarios based interview Q&As on N items per group
06: 50+ SQL scenarios based interview Q&As on unique N items per group
07: 50+ SQL scenarios based interview Q&As on Pivot Vs. Unpivot
08: 50+ SQL scenarios based interview Q&As on CASE statements & NULL safe join
09: 50+ SQL scenarios based interview Q&As on GROUP_CONCAT() & STRING_AGG()
10: 50+ SQL scenarios based interview Q&As on split delimited column values to rows
11: 50+ SQL scenarios based interview Q&As on LEAD(..) & LAG(..) window functions
12: 50+ SQL scenarios based interview Q&As on N<sup>th</sup> value with variations
13: 50+ SQL scenarios based interview Q&As on self-join
14: 50+ SQL scenarios based interview Q&As on order of SQL executions
15: 50+ SQL scenarios based interview Q&As on pivoting & aggregate functions
15+ SQL optimisation interview questions & answers with scenarios
16: 50+ SQL scenarios based interview Q&As on joins to reconcile source & target tables
17: 50+ SQL scenarios based interview Q&As on teams & matches played
18: 50+ SQL scenarios based interview Q&As on account balance
19: 50+ SQL scenarios based interview Q&As on effective_date
20: 50+ SQL scenarios based interview Q&As on first visit vs repeated visits
21: 50+ SQL scenarios based interview Q&As on distinct count of all columns
22: 50+ SQL scenarios based interview Q&As on recursion
23: 50+ SQL scenarios based interview Q&As - Join counts
24: 50+ SQL scenarios based interview Q&As - Window Query
25: 50+ SQL scenarios based interview Q&As - get the last non null value
25+ SQL interview questions & answers - beginner
25+ SQL interview questions & answers - intermediate to experienced
26: 50+ SQL scenarios based interview Q&As - number of logins by transaction count
26: 50+ SQL scenarios based interview Q&As - Window function (i.e. OVER(...)) with GROUP BY
27: 50+ SQL scenarios based interview Q&As - identifying consecutive records - job status repetition
28: 50+ SQL scenarios based interview Q&As - identifying consecutive logins
29: 50+ SQL scenarios based interview Q&As - Non-Equi Join problem
30: 50+ SQL scenarios based interview Q&As - Data cleaning, quality checks & profiling
31: 50+ SQL scenarios based interview Q&As - Finding records from first table where no match found in second table
32: 50+ SQL scenarios based interview Q&As - use of unpivot, lag(..), row_num(..), cumulative sum() and CTE
33: 50+ SQL scenarios based interview Q&As - Nuances of NULL in SQL
Common Table Expressions (i.e. CTE) in SQL using the "WITH" clause & RECURSIVE CTE
Defining tables in postgresql with primary key, foreign key, unique constraint & data migration example
MySQL import and export of data via command line using mysqldump & mysql
SQL procedures vs functions with postgresql (i.e. plpgsql) examples
SQL querying Temporal tables & SCD Type 2
SQL retrieving the latest records interview Q&As
Big Data - 02: Data Modelling
(13)
00: 13 Data modelling interview Q&As - Fact Vs Dimension, CDC, SCD, etc - part 1
00: 13 Data modelling interview Q&As - Fact Vs Dimension, CDC, SCD, etc - part 2
01: Data Backfilling interview questions & answers
03: Databricks - Spark SCD Type 1
04: Databricks - Spark SCD Type 2
04a: Databricks – Spark SCD Type 1 with Merge
04b: Databricks – Spark SCD Type 2 with Merge
05: Q37-Q41 - Data lake & metadata interview Q&As
10 ERD (Entity-Relationship Diagrams) Interview Q&As
Apache Hive for Slowly Changing Dimension (i.e. SCD) interview Q&As
Canonical Data Model (i.e. CDM) interview Q&As
Data categories in Data warehouse & Data lake
SQL querying Temporal tables & SCD Type 2
Big Data - 03: Data Warehouse
(5)
00: 13 Data modelling interview Q&As - Fact Vs Dimension, CDC, SCD, etc - part 1
00: 13 Data modelling interview Q&As - Fact Vs Dimension, CDC, SCD, etc - part 2
01: Data Backfilling interview questions & answers
05: ETL & ELT architecture interview Q&As
Straight Through Processing, OLTP, Data warehousing & OLAP
Big Data - 04: Hadoop
(5)
07: Q62 - Q70 HDFS blocks Vs. splits & Spark partitions Interview Questions & Answers
11: Q88 - Q91 Read-Write Vs Append-Only File Systems
12: Q92 - Q97 Hadoop file formats and how to choose
18: Q121 - Q124 Choosing between HDFS & AWS S3 for BigData projects interview Q&As
More HDFS & NameNode interview Q&As
Big Data - 05: MapReduce
(1)
03: Q16 - Q26 Hadoop MapReduce interview questions & answers
Big Data - 06: Hive
(6)
09: Q76– Q88 Apache Hive partitioning, bucketing, map join, skewed data, vectorization & denormalization interview Q&As
10 Apache Hive scenarios interview Q&As on backup, repair, partition, drop, etc
13: Q98 - Q104 Apache Hive Basics Interview questions & answers
Apache Hive for Slowly Changing Dimension (i.e. SCD) interview Q&As
Q01 - Q07 Scenarios Based Hive Interview Q&As
Q08- Q12 Scenarios Based Hive Query Language (i.e. HQL) Interview Q&As
Big Data - 07: Impala
(1)
10+ Apache Impala Interview Q&As
Big Data - 08 PySpark
(22)
01: Installing & getting started with Pyspark on Mac tutorial
02: Pyspark with schema & a simple join of two data frames example
03: Pyspark testing interview Q&As with unittest tutorial
04: Pyspark testing interview Q&As with pytest tutorial
05: Pyspark read from a file & add new columns interview Q&As with tutorial
06: Pyspark SCD Type 1 & Type 2 Interview Q&As with tutorials
07: PySpark built-in functions Interview Q&As with tutorials
08: PySpark window functions Interview Q&As with tutorials
09: PySpark GroupBy & explode functions Interview Q&As with tutorials
10: PySpark working with parquet file format Interview Q&As with tutorials
11: PySpark working with AVRO file format Interview Q&As with tutorials
12: PySpark working with SQL syntax Interview Q&As with tutorials
13: PySpark with Apache Kafka Interview Q&As with tutorials - part 1
14: PySpark with Apache Kafka Interview Q&As with tutorials - part 2
15: PySpark with Apache Kafka Interview Q&As with tutorials - part 3
16: PySpark to read JSON files Interview Q&As with tutorials
17: PySpark problem solving Interview Q&As with tutorials - problem 1
18: PySpark problem solving Interview Q&As with tutorials - problem 2
19: PySpark on handling duplicates Interview Q&As with tutorials
20: PySpark Dataframe Vs Pandas Dataframe Interview Q&As with tutorials
21: PySpark map vs flatMap Interview Q&As with tutorials
22: PySpark Row object Interview Q&As with tutorials
Big Data - 08: Spark
(33)
00: Apache Spark eco system & anatomy interview questions and answers
02: Cleansing & pre-processing data in BigData & machine learning with Spark interview questions & answers
03: Pyspark testing interview Q&As with unittest tutorial
04: Pyspark testing interview Q&As with pytest tutorial
11a: 40+ Apache Spark best practices & optimisation interview FAQs – Part 1
11b: 50+ Apache Spark best practices & optimisation interview FAQs - Part 2 Spark UI
11c: 50+ Apache Spark best practices & optimisation interview FAQs – Part 3 Partitions & buckets
11d: 50+ Apache Spark best practices & optimisation interview FAQs - Part 4 Small Files problem
11e: 50+ Apache Spark best practices & optimisation interview FAQs - Part 5 Cache Vs Persist Vs Checkpoint
11f: 50+ Apache Spark best practices & optimisation interview FAQs - Part 6 Serialization & UDFs
12 Apache Spark getting started interview questions and answers
14: Q105 - Q108 Spark "map" vs "flatMap" interview questions & answers
15: Q109 - Q113 Spark RDD partitioning and "mapPartitions" interview questions & answers
17: Spark interview Q&As with coding examples in pyspark (i.e. python)
5 Spark streaming & Apache storm Interview Q&As
6 Delta Lake interview questions & answers
8 Apache Spark repartition Vs. coalesce scenarios interview Q&As
8 Apache Spark streaming interview questions and answers
Apache Spark SQL join types interview questions and answers
Debugging Spark applications written in Java locally by connecting to HDFS, Hive and HBase
Spark interview Q&As with coding examples in Scala - part 01: Key basics
Spark interview Q&As with coding examples in Scala – part 02: partition pruning & column projection
Spark interview Q&As with coding examples in Scala – part 03: Partitioning, pruning & predicate push down
Spark interview Q&As with coding examples in Scala – part 04: Memory considerations, lazy computation & cacheing
Spark interview Q&As with coding examples in Scala – part 05: Transformations, actions, pipelining & shuffling
Spark interview Q&As with coding examples in Scala – part 06: groupBy, collect_list & explode
Spark interview Q&As with coding examples in Scala – part 07: map, flatMap, mapPartitions & mapValues
Spark interview Q&As with coding examples in Scala – part 08: pivot, unpivot, agg & selectExpr
Spark interview Q&As with coding examples in Scala – part 09: sql.functions
Spark interview Q&As with coding examples in Scala – part 10: adding new columns
Spark interview Q&As with coding examples in Scala – part 11: add column values conditionally, lit & typedlit
Spark join strategies & performance tuning interview questions and answers
Spark understanding DAG for tuning performance interview questions and answers
Big Data - 09: Databricks
(12)
01: Databricks interview questions & answers - overview
02: Databricks interview questions & answers - components
03: Databricks interview questions & answers – Azure Databricks
04: Databricks interview questions & answers - read & write from Dataframe
05: Databricks interview questions & answers - parquet data vs Delta lake
06: Databricks interview questions & answers - SQL connectivity
07: Databricks interview questions & answers - passing variables and arguments
08: Databricks interview questions & answers on optimization - Partitioning, Optimize, Z-Order & Cacheing
09: Databricks interview questions & answers on optimization - Liquid Clustering & Photon accelerator
10: Databricks interview questions & answers - clone data & describe tables
6 Delta Lake interview questions & answers
Databricks Delta Live Tables (i.e DLT) Vs Snowflake Dynamic Tables Interview Q&As
Big Data - 09: Snowflake
(7)
01: Snowflake interview questions & answers - overview, components & architecture
02: Snowflake interview questions & answers - caching & performance tuning
03: Snowflake interview questions & answers - stages, copy into, file formats, etc
04: Snowflake interview questions & answers - security, monitoring & recovery
05: Snowflake interview questions & answers - Stored Procedures, Session Variables, UDFs, etc
Databricks Delta Live Tables (i.e DLT) Vs Snowflake Dynamic Tables Interview Q&As
Snowflake Snowpark interview Questions & Answers
Big Data - 09: Spark SQL
(4)
06: Learn how to access Hive from Spark via SparkSQL & Dataframes by example
10 Spark SQL Interview Q&As
17: Spark interview Q&As with coding examples in pyspark (i.e. python)
Apache Spark SQL join types interview questions and answers
Big Data - 11: Data Governance
(2)
05: Q37-Q41 - Data lake & metadata interview Q&As
Big Data - governance & metadata management interview Q&As
Big Data - 11: NoSQL
(4)
01: NoSQL interview Q&As - Key Value, Wide Column, Document & Graph databases
06: Q51 - Q61 HBase Interview Questions & Answers
10: Q80 - Q87 HBase Schema Design Interview Q&As
InfluxDB interview questions & answers
Big Data - 12: Data security
(3)
12 Kerberos interview Q&As
6 LDAP Interview Q&As
Big Data - governance & metadata management interview Q&As
Big Data - 13: Analytics & DS
(6)
01: Q01 - Q07 General Big Data, Data Science & Data Analytics Interview Q&As
02: Cleansing & pre-processing data in BigData & machine learning with Spark interview questions & answers
03: Simple Linear Regression interview Q&As
04: Residuals, Cost/Loss functions, R-squared & Gradient Descent interview Q&As
05: Linear regression outputs, null hypothesis, t-test & p-value interview Q&As
What do data analysts, engineers & scientists do?
Big Data - 14: AWS & Azure
(22)
01: AWS interview Q&As on VPC, Subnets, Availability Zones, VPN, Route tables, NACLs & Security Groups
01: Azure interview Q&As on Region, VNet, Subnets, AZs, Availability Set, etc
02: AWS Identity & Access Management (i.e. IAM) interview Q&As
02: Azure interview Q&As on Virtual Network Peering, VPN, ExpressRoute, etc
03: Azure interview Q&As on storage account
04: Azure interview Q&As on compute
05: Azure interview Q&As on Security
06: Azure interview Q&As on Resource Groups & Resource Manager
12 Amazon Redshift interview Q&As
15+ Amazon EC2 instances interview Q&As
15+ AWS Services overview interview Q&As
18 Amazon S3 interview Q&As
18: Q121 - Q124 Choosing between HDFS & AWS S3 for BigData projects interview Q&As
21: Q138 - Q142 AWS data lakes overview Interview Q&As
5 Amazon EMR Vs. Cloudera interview Q&As
Amazon Athena, Redshift, Redshift spectrum & Presto Q&As
AWS CI/CD interview questions & answers
AWS Data pipeline architecture interview Q&As
AWS Interview Q&As on ECS, EKS & Fargate
AWS Web Application Security Q&As
Azure Data Factory vs AWS Glue Interview Q&As
Multi-tenant Architecture Interview Q&As
Big Data - 15: Sqoop & Nifi
(3)
05: Q37 – Q50 Apache Flume interview questions & answers
10+ Apache NiFi interview Q&As
13 Apache Sqoop interview Q&As
Big Data - 16: Yarn, Zookeeper
(5)
19: Q125 - Q130 Apache Zookeeper interview Q&As
20: Q131 - Q137 FAQ Apache Solr with HDFS interview questions & answers
5 Apache YARN interview Q&As
Finding your way around YARN and Spark on Cloudera
Zookeeper example - getting started tutorial with Java & Docker
Scala Interview FAQs
Scala Interview FAQs
(36)
01: Scala Functional Programming basics - pure functions, referential transparency & side effects
02: Scala FP basics: First-class function, higher order function, statements Vs expressions, immutability & recursion
02B: Scala FP basics: Explain the below Scala code
03: Q1 - Q6 Scala interview Q&As on Functional Programming
04: Currying, partial application & functional composition in Scala
04: Q6 - Q12 Scala FP currying, closures & partial functions interview Q&As
05: Q13 – Q18 Scala FP combinators interview questions & answers
05: Q27 - Q32 Scala idioms Q&As on Option-Some-None, Try-Success-Failure and Either-Left-Right
06: Scala Class Vs. Object and Companion object interview Q&As
06C: Q33 – Q40 Scala Futures and Promises Interview Q&As
07: Q41 - Q48 Scala Async and Actor System Interview Q&As
07: Scala Factory Method Pattern & Trait Vs Abstract classes
08: Q19 - Q26 Scala Data Structures basics interview questions & answers
08: Q49 - Q58 Scala Implicits Interview Q&As
09: Q59 - Q65 Higher Order Functions in Scala Interview Q&As
10: Q66 - Q70 Pattern matching in Scala Interview Q&As
11A: Scala values, proper types, first order types & higher kinded types
11B: Q71 - Q72 - Scala type parameterization & variance interview Q&As
11C: Q73 - Q77 - Scala type parameterization & variance interview Q&As
11D: Scala existential type interview Q&As
12: Q78 - Q80 Recursion in Scala Q&As explained with diagrams
13A: Scala Semigroup interview Q&As
13B: Q81 - Q83 Scala monoids interview Q&As
13B: Scala foldLeft, foldRight, scanLeft, scanRight, reduceLeft, reduceRight, etc are Monoids
14: Q84 - Q87 Category Theory With Scala Interview Q&As
15: Q88 – Q92 Scala Functors Interview Q&As
15B: Scala Functors Interview Q&As by example
16: Q93 – Q98 Scala monads interview Q&As
16B: Scala Monoids, Functors & Monads interview Q&As
17: Q99 – Q103 Scala applicative functors interview Q&As
18: Q104 - Q108 Scala typeclass pattern for decoupling with polymorphism
19: Q109 - Q113 Scala ADT (Algebraic Data Types) Interview Q&As
20: Q114 – Q120 Scala fold vs reduce Q&As
21: Q121 - Q124 Scala Extractor Interview Q&As
22: What are the uses of underscore i.e _ in Scala?
23: Scala Traits, Mixins, self-type annotation & DI with Cake pattern
Scala way of coding
(22)
01: Coding "Java way in Scala" Vs "Scala way in Scala"
02: Coding Scala Way - Recursion & Iterator in FP
03: Coding Scala Way – Lazy Eval
04: Coding Scala Way – Null checks with Option-Some-None
05: Coding Scala Way - FP concepts
06: Coding Scala Way - Reduce & Compose functions
07: Coding Scala Way – Regular Expressions
08: Coding Scala Way - Recursion & Higher Order Function
09: Coding Scala Way - Fibonacci Series
10: Coding Scala Way - groupBy, mapValues & identity
11: Coding Scala Way - Actors with Akka - part 1
12: Coding Scala Way - Actors with Akka "Ask Pattern" - Part 2
13: Coding Scala Way - 2 Actors with Akka - part 3
14: Coding Scala Way – Scala concurrency with Future
15: Coding Scala Way – Scala concurrency & closure vs function definition
16: Coding Scala Way – Scala concurrency styles
17: Coding Scala Way - What is wrong with this code?
3 Reasons Why I started Learning Scala
FAQs Data: 01: Getting started with Spark Scala on IntelliJ IDEA
FAQs Data: 02: Getting started with Spark Scala on IntelliJ IDEA with Maven
FAQs Data: 03: ScalaTest using IntelliJ IDEA IDE
FAQs Data: 04: ScalaTest of Spark using IntelliJ IDEA IDE
Python interview FAQs
(38)
00: Python dynamic typing, module Vs package and Class Vs Object interview Q&As
00a: Python modules, packages, PYTHONPATH, sys.path, dependencies, etc interview Q&As
00b: Python variable scopes, assigning types optionally and execution order interview Q&As
00d: Getting started with Python on Mac OS
01: Python Iterators, Generators & Decorators interview Q&As & Tutorial
02: Getting started with conda on Mac OS
02: Python comprehensions interview Q&As & tutorial
03: Python context manager interview Q&As & tutorial
04: In Python functions are objects tutorial
05: Python debugging tutorial
06: Object introspection in Python tutorial
07: Python dictionary tutorial
08: Python Data modelling tutorial - Dunder or Magic Methods, Duck Typing & Protocols
09: Python working with String tutorial
10: Python working with collections tutorial
11: Python *args and **kwargs tutorial
12: Python enumerate vs zip interview Q&As and tutorial
13: Python working with files tutorial
14: Python Closures, Partial functions and Currying tutorial
15: Python multithreading tutorial
16: Python multithreading producer/consumer & semaphores tutorial
17: Python OOP and @property decorator tutorial
18: Python Abstract Base Classes (i.e. ABC) tutorial
19: Python operator overloading tutorial
20: Python function overloading tutorial
21: Python function overriding tutorial
22: Python Duck typing tutorial
23: Python coding questions - magic method, generator & debugging
24: Python coding questions – formatting, join, regex & write a program
25: Python protocol classes tutorial & interview Q&As
26: Python Dataclasses interview Q&As
27: NumPy Vs Pandas interview questions & answers - part 1
28: NumPy Vs Pandas interview questions & answers - part 2
29: NumPy Vs Pandas interview questions & answers - part 3
30: Python coding questions – removing duplicates & write a program
31: Python coding questions - characters by frequency, anagrams, recursion, etc
32: Python coding questions - Error Handling & Logging
33: Python coding questions - file operations & handling large files

300+ Java Interview Questions - FAQs

Java Interview FAQs 300+
Java FAQs - 01: Prepared?
(2)
12 things to know about job interviews
How to prepare to succeed in Java job interviews?
Java FAQs - 02: Ice Breaker
(5)
04: As a Java developer, can you think of a time where you ......?
07: 20+ Pre interview refresher on tools
10+ Know your industry Q&As
15 Ice breaker interview Q&As asked 90% of the time
8 real life Java scenarios with Situation-Action-Result (i.e. SAR) technique
Java FAQs - 03: Core Java
(15)
00: Top 50+ Core Java interview questions & answers - Q01 - Q10
00: Top 50+ Core Java interview questions answered - Q11 to Q23
00: Top 50+ Core Java interview questions answered - Q24 to Q36
00: Top 50+ Core Java interview questions answered - Q37 to Q42
00: Top 50+ Core Java Interview questions answered - Q43 to Q54
01: 15+ Java multithreading interview questions & answers
02: 10 Java String class interview Q&As
02: 5 Java multithreading scenarios interview Questions & Answers
03: 7 Things you must know about Java locks and synchronized key word
03: Understanding Big O notations with Java
17 Java Collection interview questions & answers
7 Java Modifiers every interviewer likes to quiz you on
9 Java Garbage Collection interview questions & answers
Java Generics in no time "? extends" & "? super" explained with a diagram
Q1 - Q10 Java OOPs interview Q&As
Java FAQs - 03 Java versions 9 to 20
(7)
01: Java 9+ modules interview Q&As
02: Java 9 to 20 features interview Q&As - var & switch expressions with patterns
03: Java 9 to 20 features interview Q&As - text blocks
04: Java 9 to 20 features interview Q&As - Records
05: Java 9 to 20 features interview Q&As - Sealed Classes & Interfaces
07: Java 9 to 20 features interview Q&As - JShell & Collection factory methods
08: Java 9 to 20 features interview Q&As - Virtual Threads
Java FAQs - 04: OOP & FP
(10)
01: 19 Java 8 Functional Programming (FP) Interview Q&As
03: Q16 - Q17 Java Polymorphism vs Overriding vs Overloading
04: Q18 Explain abstraction, encapsulation, Inheritance, and polymorphism with the given Java code?
05: Q19-Q24 How to create a well designed Java application?
06: Q25 - Q32 SOLID design principles interview questions & answers for Java developers
07: Q33 Top 5 OOP tips for Java developers
08: Write code to add, subtract, multiply, and divide given numbers?
5 FAQs on transforming your thinking from OOP to FP
Q1 - Q10 Java OOPs interview Q&As
Why favour composition over inheritance?
Java FAQs - 05: JEE
(12)
01: 12 Web basics every Java web developer must know - Part 1
02: JavaScript mistakes interview Q&As
03: 21+ Java Servlet interview Q&As
04: 7 JSP interview questions and answers
06: Web design patterns MVC2, MVP, MVVM & MVW
12 FAQ JDBC interview Q&As
12 Web basics every Java web developer must know – Part 2
8 JEE (i.e. Java EE) Overview interview Q&As
9 JNDI and LDAP interview Q&A
Client-side & Server side view technologies Q&As
Q01-Q28: Top 50+ FAQ JEE interview Q&As
Q29-Q53: Top 50+ FAQ JEE Interview Q&As
Java FAQs - 06: Spring
(10)
01: 15 Spring Boot interview Questions & Answers
01: Q01 - Q07 Spring framework core interview Q&As
01: Spring DI & IoC interview Q&As
01b: Q08 - Q13 Spring interview Q&As
03: Spring Boot annotations interview Q&As
04 17 Spring bean life cycles & scopes FAQs
05: 9 Spring Bean scopes interview Q&A
11 Spring MVC Interview Q&As
Spring Boot Exception handling Interview Q&As
Spring Cloud Microservices interview Q&As
Java FAQs - 07: Hibernate
(4)
8 Hibernate interview Q&As
8 JPA interview questions and answers
Hibernate First & second level cache interview Q&As
Q08 - Q15 Hibernate interview Q&As
Java FAQs - 08: Web Services
(6)
01: 7 Java Web Services SOAP Vs REST Interview Q&As
01: Q13 "12 Rules" for REST API design & development
02: 6 Java RESTful Web services Interview Q&As
05: REST Service URI conventions with Spring MVC
06: RESTful Web services and HATEOAS Q&A
09: 11 SOAP Web service interview Q&As
Java FAQs - 09: Microservices
(12)
01: 15 Spring Boot interview Questions & Answers
01: Q07 - Q12 Microservices Interview questions & answers
02: 8 Spring Boot interview Q&As
02: Microservices Architecture design patterns & considerations interview Q&As - Part 1
03: Kubernetes (i.e. Minikube) - deploy a spring boot microservice app
03: Microservices Architecture design patterns & considerations interview Q&As - Part 2
04: Microservices Architecture design patterns & considerations interview Q&As - Part 3
05: Microservices Architecture design patterns & considerations interview Q&As - Part 4
10+ Domain Driven Design (i.e. DDD) Interview Q&As
10+ Key Java Microservices Interview Questions & Answers
Event sourcing & CQRS interview Q&As
Spring Cloud Microservices interview Q&As
Java FAQs - 10: Messaging
(4)
01: 15+ Apache Kafka must-know basics interview Q&As - Part 1
01: 15+ Apache Kafka must-know basics interview Q&As - Part 2
01: 15+ Apache Kafka must-know basics interview Q&As – Part 3
16 FAQ JMS interview Q&As
Java FAQs - 11: Architecture
(5)
01: 30+ Java architect interview questions & answers - Part 1
02: 30+ Java architect interview questions & answers - Part 2
03: 30+ Java architect interview questions & answers - Part 3
03: How would you go about designing an online shopping cart?
04: How to go about designing a medium size JEE app?
Java FAQs - 12: RDBMS
(2)
10 ERD (Entity-Relationship Diagrams) Interview Q&As
15 Database design interview Q&As
Java FAQs - 13: SQL
(6)
0: 20+ SQL best practices & optimisation interview Q&As
00: 50+ SQL scenarios based interview Q&As on identifying & deleting duplicate records
02: 50+ SQL scenarios based interview Q&As on joins, CDC and recursive CTE
15+ SQL optimisation interview questions & answers with scenarios
25+ SQL interview questions & answers - beginner
25+ SQL interview questions & answers - intermediate to experienced
Java FAQs - 14: Code Quality
(4)
00: Ensuring code quality in Java Q&As
30+ Java Code Review Checklist Items
5 Java unit testing interview Questions and Answers
8+ JMeter performance testing interview Q&As
Java FAQs - 15: Key Areas
(14)
02: 15 key considerations for low latency Java applications
12 Java design patterns interview Q&As
15 Security key area interview Q&A for Java developers
18 Agile Development interview Q&A for Java developers
4 FAQ Performance tuning in Java interview Q&As
4 JEE Design Patterns Interview Q&As
5 Java concurrency management interview Q&As
6 Scaling your Java applications interview Q&As
8 Java memory management interview Q&As
9 Java Transaction Management Interview Q&As
Flyweight design pattern to improve memory usage & performance
Monitoring/Profiling Java applications interview Q&A
QoS & SLAs interview Q&As on Availability, Serviceability, Fault tolerance & Disaster Recoverability - Non Functional Requirements
Top 10 causes of performance issues in Java
Java FAQs - 16: UML
(1)
12 UML interview Q&As
Java FAQs - 17: GIT
(4)
01: 12+ Git Source control must know basics interview Q&As
02: 6 More Git interview Q&As
03: Understanding Git terms origin, master, and head
04: Git Merging Vs rebasing must know interview questions and answers
Java FAQs - 18: Linux
(3)
01: 14 Unix must-know interview questions & answers
02: Top 10 Linux interview Q&As
03: Shell script interview Q&As for Java developers
Java FAQs - 19: DevOps (CI/CD)
(9)
01: 12+ Git Source control must know basics interview Q&As
01: 21 Docker DevOps interview Q&As
02: 20+ Kubernetes (aka K8s) interview questions & answers
03: Kubernetes (aka k8s) interview Q&As - objects & manifest files
04: Kubernetes (i.e k8s) interview Q&As - Volumes, PVs, PVCs & StorageClass
05: Kubernetes (i.e k8s) interview Q&As - Service Vs Ingress
06: Kubernetes (i.e k8s) interview Q&As - Helm charts, Argo CD & Prometheus
17+ DevOps CI/CD Jenkins interview Q&As
4 DevOps interview Q&As
Java FAQs - 20: AWS (Cloud)
(5)
01: AWS interview Q&As on VPC, Subnets, Availability Zones, VPN, Route tables, NACLs & Security Groups
02: AWS Identity & Access Management (i.e. IAM) interview Q&As
15+ Amazon EC2 instances interview Q&As
15+ AWS Services overview interview Q&As
18 Amazon S3 interview Q&As
Java FAQs - 21: Maven
(1)
01: 12 Maven interview Questions & Answers
Java FAQs - 22: Regex
(2)
8 Regular Expressions (aka Regex) by examples for Engineers
Regular Expressions interview Q&As for Java developers
Java FAQs - 23: JSON & XML
(3)
17 XML basics interview Q&As
6 JSON interview Q&As
YAML with Spring & Java interview Q&As
Java FAQs - 24: JMeter
(2)
8+ JMeter performance testing interview Q&As
JMeter for performance testing REST services with BeanShell
Spring & Hibernate Interview FAQs
Framework - Hibernate Q&As
(13)
02: Understanding Hibernate proxy objects and avoiding potential pitfalls
03: Identifying and fixing NonUniqueObjectException in Hibernate
04: Identifying and fixing LazyInitializationException in Hibernate
05: Debugging Hibernate & handling 4 common issues
07: Hibernate mistakes - accessing objects outside of a transaction
08: Hibernate automatic dirty checking of persistent objects and handling detached objects
09: Hibernate entities with auditable, soft delete & optimistic locking fields
10: Spring, JavaConfig (i.e @Configuration), JPA & Hibernate by example
11: Hibernate dependency jars and plugins
12: Hibernate custom data type : Blob type example
8 Hibernate interview Q&As
Hibernate First & second level cache interview Q&As
Q08 - Q15 Hibernate interview Q&As
Framework - Spring Core
(6)
01: Q01 - Q07 Spring framework core interview Q&As
01: Spring DI & IoC interview Q&As
01b: Q08 - Q13 Spring interview Q&As
04 17 Spring bean life cycles & scopes FAQs
05: 9 Spring Bean scopes interview Q&A
07. ⏯ Spring DI with Maven beginner video tutorial
Framework - Spring MVC
(7)
01: Spring MVC beginner tutorial step by step
02: Spring MVC form submission tutorial step by step
03: Spring MVC with Java Configs instead of XML configs step by step
04: Spring MVC with Thymeleaf and JavaConfigs
05: Spring 4 MVC RESTful Web Service Beginner Tutorial step by step
06: Spring 4 MVC RESTful GET & POST methods Web Services Tutorial
11 Spring MVC Interview Q&As
Framework - Spring Cloud
(1)
Spring Cloud Microservices interview Q&As
Framework - Spring boot
(4)
01: 15 Spring Boot interview Questions & Answers
02: 8 Spring Boot interview Q&As
03: Spring Boot annotations interview Q&As
Spring Boot Exception handling Interview Q&As
Framework - Spring IO
(1)
Spring IO tutorial in 6 steps
Framework - Spring Config
(5)
10: Spring, JavaConfig (i.e @Configuration), JPA & Hibernate by example
Spring loading property files & properties
Spring, JavaConfig (@Configuration), and TransactionManager
Spring, JavaConfig (i.e @Configuration) & JDBC by example
Spring, JavaConfig (i.e @Configuration) & JMS by example
Java Architect Interview FAQs
Architecture - Patterns
(10)
01: 30+ Java architect interview questions & answers - Part 1
01: Q07 - Q12 Microservices Interview questions & answers
02: 30+ Java architect interview questions & answers - Part 2
03: 30+ Java architect interview questions & answers - Part 3
03: How would you go about designing an online shopping cart?
04: How to go about designing a medium size JEE app?
06: Web design patterns MVC2, MVP, MVVM & MVW
10+ Key Java Microservices Interview Questions & Answers
8 JEE (i.e. Java EE) Overview interview Q&As
Multi-tenant Architecture Interview Q&As
Architecture - How to
(17)
01: 12 Web basics every Java web developer must know - Part 1
01: 13 Java low latency interview questions & answers
01: 30+ Java architect interview questions & answers - Part 1
01: High level & low level system design considerations for read heavy systems
01: High level & low level system design considerations for write heavy systems
02: 30+ Java architect interview questions & answers - Part 2
02: HTTP basics on headers, MIME types, & cookies for Java developers
03: 30+ Java architect interview questions & answers - Part 3
03: How would you go about designing an online shopping cart?
12 Web basics every Java web developer must know – Part 2
18 Java scenarios based interview Q&As for the experienced - Part 1
18 Java scenarios based interview Q&As for the experienced - Part 2
3 key "How would you go about ..." Q&As to judge Java experience
How to become a Java architect?
How would you go about.. building an ETL pipeline to handle 3k TPS (i.e transactions per second)
SDLC process interview Q&As
XMPP, MQTT and Web Sockets protocols for building messaging & chat applications
Architecture - AWS
(10)
01: AWS interview Q&As on VPC, Subnets, Availability Zones, VPN, Route tables, NACLs & Security Groups
02: AWS Identity & Access Management (i.e. IAM) interview Q&As
15+ Amazon EC2 instances interview Q&As
15+ AWS Services overview interview Q&As
18 Amazon S3 interview Q&As
AWS CI/CD interview questions & answers
AWS Data pipeline architecture interview Q&As
AWS Interview Q&As on ECS, EKS & Fargate
AWS Web Application Security Q&As
Multi-tenant Architecture Interview Q&As
Architecture - Azure
(6)
01: Azure interview Q&As on Region, VNet, Subnets, AZs, Availability Set, etc
02: Azure interview Q&As on Virtual Network Peering, VPN, ExpressRoute, etc
03: Azure interview Q&As on storage account
04: Azure interview Q&As on compute
05: Azure interview Q&As on Security
06: Azure interview Q&As on Resource Groups & Resource Manager
Architecture - Distributed
(8)
10 Distributed storage & computing systems interview Q&As - Big Data
10+ Key Java Microservices Interview Questions & Answers
19: Q125 - Q130 Apache Zookeeper interview Q&As
5 Spark streaming & Apache storm Interview Q&As
9 Distributed systems interview Q&As - Microservices
9 Java Transaction Management Interview Q&As
Event sourcing & CQRS interview Q&As
Spring Cloud Microservices interview Q&As
Architecture - Microservices
(11)
01: Q07 - Q12 Microservices Interview questions & answers
01: Q13 "12 Rules" for REST API design & development
02: Microservices Architecture design patterns & considerations interview Q&As - Part 1
03: Microservices Architecture design patterns & considerations interview Q&As - Part 2
04: Microservices Architecture design patterns & considerations interview Q&As - Part 3
05: Microservices Architecture design patterns & considerations interview Q&As - Part 4
06: Microservices Architecture design patterns & considerations interview Q&As - Part 5
10+ Domain Driven Design (i.e. DDD) Interview Q&As
10+ Key Java Microservices Interview Questions & Answers
QoS & SLAs interview Q&As on Availability, Serviceability, Fault tolerance & Disaster Recoverability - Non Functional Requirements
Spring Cloud Microservices interview Q&As
Architecture - Networking
(6)
01: Networking basics interview Q&As on ip address, subnet mask, DNS & gateway
02: Networking basics interview Q&As on Protocols
03: Networking basics interview Q&As on VPN, Proxy Server & Reverse Proxy
04: Networking basics interview Q&As on OSI model
05: Networking basics interview Q&As on Firewall, Route Tables, Firewall rules, DMZ & NAT
XMPP, MQTT and Web Sockets protocols for building messaging & chat applications
Architecture - QoS
(1)
QoS & SLAs interview Q&As on Availability, Serviceability, Fault tolerance & Disaster Recoverability - Non Functional Requirements
Architecture - ERD
(1)
10 ERD (Entity-Relationship Diagrams) Interview Q&As
Architecture - ETL
(3)
05: ETL & ELT architecture interview Q&As
08: Q71 - Q75 ETL/ELT on BigData Interview Q&As
How would you go about.. building an ETL pipeline to handle 3k TPS (i.e transactions per second)
Architecture - Low Latency
(6)
01: 13 Java low latency interview questions & answers
02: 15 key considerations for low latency Java applications
03: Java GC tuning for low latency applications
1. Asynchronous processing in Java real life examples - part-1
2. Asynchronous processing in Java real life examples - part-2
Why acquire skills & experience in low latency & Big Data? What specific skills are required?
Architecture - UML
(1)
12 UML interview Q&As
Java code quality interview Q&As
Code Quality - Automation
(1)
Selenium and Web Driver Interview Questions and Answers
Code Quality - Code Coverage
(2)
Jacoco for unit test coverage with SonarQube tutorial
Maven and Cobertura Tutorial
Code Quality - FAQs
(7)
00: Ensuring code quality in Java Q&As
01: 6 JUnit & JMockit interview questions & answers on Java Unit testing - Part 1
02: 6 JUnit & JMockit interview questions & answers on Java Unit testing - Part 2
03: JUnit & Mockito Interview Questions & Answers
30+ Java Code Review Checklist Items
5 Java unit testing interview Questions and Answers
8+ JMeter performance testing interview Q&As
Code Quality - Profiling
(3)
01: jvisualvm tutorial to sample Java heap memory
02: jvisualvm to detect memory leak - a quick tutorial style Java demo
jvisualvm to debug deadlocks in Java
Code Quality - Performance
(2)
8+ JMeter performance testing interview Q&As
JMeter for performance testing REST services with BeanShell
Code Quality - Unit Testing
Code Quality - BDD
(4)
Java BDD (Behavior Driven Development) interview Q&A
jBehave and BDD example
jBehave and jUnit for BDD
jBehave with tabular story data
Code Quality - JMockit
(15)
01: JMockit interview Q&As & examples on @Injectable Vs @Mocked Vs @Capturing Vs @Tested
02: JMockit interview Q&As & examples on Expectations & Verifications
03: JMockit interview Q&As & examples on initialising @Injectable fields
04: JMockit interview Q&As & examples on @Injectable vs @Mocked
05: JMockit interview Q&As & examples on Partial Mocking with Expectations(Object..)
06: JMockit interview Q&As & examples on Partial Mocking with MockUp<T>
07: JMockit interview Q&As & examples on replaying with result field, returns(...) method & Delegate interface
08: JMockit interview Q&As & examples on MockUp<T> with Invocation.proceed()
09: JMockit interview Q&As & examples on matching of argument values
10: JMockit interview Q&As & examples on matching anyX field and withX() methods
11: JMockit interview Q&As & examples on matching withArgThat(org.hamcrest.Matcher)
12: JMockit interview Q&As & examples on matching with(Delegate)
13: JMockit interview Q&As & examples on Deencapsulation utility class
14: JMockit interview Q&As & examples on Mocking a super class
15: JMockit interview Q&As & examples on Mocking a Singleton
Code Quality - Mockito
(4)
01: Mockito interview Q&As & examples on @Mock, @Spy, @Captor and @InjectMocks
02: Mockito interview Q&As & examples on @Spy
03: Mockito interview Q&As & examples on @Mock, Mockito.mock(...) and @MockBean
04: Mockito interview Q&As & examples - PowerMock for mocking private & static methods
Code Quality - Unit Testing FAQs
(3)
5 Java unit testing interview Questions and Answers
JUnit with Hamcrest
Spring Boot in unit testing - 6 things you must know
Code Quality – Testing DAOs
(4)
Part #3: JPA Hibernate Spring Maven Eclipse Tutorial - testing data access with HSQLDB
Unit Test Hibernate - DAO Layer with JPA, Spring & HSQLDB
Unit Test Hibernate - DAO Layer with Spring & HSQLDB
Unit Testing Data Access Logic in Java
Code Quality – JUnit & Mockito
(6)
01: JUnit with Mockito tutorial step by step
02: Unit testing with JUnit, Mockito & Spring
03: Mockito to fully mock the DAO layer
04: Mockito partially mocking with @Spy
05: Mockito & PowerMock partially mocking private methods with @Spy
06: Mockito & PowerMock for mocking static methods
Code Quality – JUnit Web
(2)
Spring Controller Unit Testing
Unit Testing Servlet filter with Mockito
Code Quality - Spring TXN
(2)
Integration Unit testing Spring Transaction Management
Unit testing Spring Transaction Management
Java coding interview Q&As
Coding - Can you write code?
(22)
05: Finding the 2nd highest number in an array in Java
08: Write code to add, subtract, multiply, and divide given numbers?
20 Java coding interview questions - tips & considerations
Fibonacci number
Fibonacci number with caching and Java 8 FP
Find 2 numbers from an array that add up to the target
Find the first non repeated character in a given string input
Finding the missing numbers Java example
Finding the perfect number
Fizz Buzz
Generating random numbers in Java
Huffman coding in Java
Iteration Vs Recursion in Java
Java 8 String streams and finding the first non repeated character with functional programming
Java coding practice problems - prime and powerful
Java coding question on recursion and generics
Palindrome
Reverse a given String
Reverse Polish Notation (RPN)
Sorting a list of numbers by frequencies in Java using a BST tree
Sorting a list of numbers by frequencies in Java using a map
Splitting input text & string processing coding Q&A
Coding - Complete the code
(13)
01: String parsing & date formatting - complete the given code
02: Working with Java Collections - Complete the given code
03: Tree navigation - is a BST Tree?
04: Are Anagrams - Complete the given code
05: Is a palindrome - complete the given code
06: Change Dir Path - String parsing & working with collections
07: Index of long consecutive characters in a string - flow control
08: Jumping Frog problem in Java - Complete the given code
09: Find all permutations of a given string - best example to understand recursion
10: Find all permutations of a given string - Iteration in Java
11: Threads performing tasks by talking to each other
12: Complete the trades matching logic
13: Atomicity, Visibility, & synchronization in Java
Coding - Converting from A to B
(6)
04: Convert Lists to Maps and Maps to Lists with Java 8 power
Convert Arrays to Lists and lists to array with real life example(s)
Convert Java Date/Time to String & String back to Date/Time
Converting a BST Tree to a List in Java
Converting an Array/List to BST in Java
Converting String to Amount and Amount to String
Coding - Designing your classes
(9)
01: Can you design classes & interfaces using OO?
02: Scenarios based Java OO concepts & GoF design patterns - naive Template Method pattern
03: Scenarios based Java OO concepts & GoF design patterns - Strategy Pattern
Class invariant & designing by contract in Java
How would you go about designing with UML diagrams
Part 1: Badly designed Java classes & interfaces
Part 2: Badly designed classes & interfaces - Single Responsibility Principle (SRP)
Part 3: Badly designed classes & interface - Open Closed Principle (i.e OCP)
Part 4: Badly designed classes & interfaces - Dependency Inversion Principle (i.e. DIP)
Coding - Data Structures
Coding - Arrays
(2)
Beginner array coding problems in Java
Find pair of numbers with a given sum in Java
Coding - Big O notation
(2)
03: Understanding Big O notations with Java
Big O notation questions and answers with Java examples
Coding - Graph Structure
(2)
Graph from scratch Java example
Graph from scratch Java example adjacent matrix approach
Coding - LinkedList Structure
(2)
Find middle element of a LinkedList in one pass Java example
LinkedList creating from scratch in Java
Coding - Map Structure
(1)
HashMap from scratch Java example
Coding - Pointer Algorithms
(3)
Find 2 numbers from an array that add up to the target
Single Pointer: Partitioning around a pivotal number
Two Pointers: Partitioning around a pivotal number
Coding - Queue Structure
(1)
Queue from scratch Java example
Coding - Searching Algo
(1)
Linear & Binary Search in Java
Coding - Sorting Algo
(4)
Quick Sort in Java
Sorting by reversing the entries in Java
Swap 2 values & bubble sort in Java
Swapping, partitioning, and sorting algorithms in Java
Coding - Stack Structure
(1)
Stack from scratch Java example
Coding - Tree structure
(14)
00: Tree from a list & flattening it back to a list in Java
01: Tree flattening example in Java with Generics
02: Tree structure - calculate average recursively & iteratively in Java
03: Tree traversal algorithms in Java
04: Tree - Get root to leaf max sum in Java example
05: Is it a valid binary search tree (BST) ?
06: Binary Tree - Sum Levels Java Example
06: Binary Tree – Get root to leaf max sum in Java example
07: Tree - Sum Levels Java example
08: Part-1: Basic Java Tree structure interview questions and coding questions
09: Part 2: Java Tree structure interview questions and coding questions
10: Part-3: Java Tree structure interview and coding questions
11: Part 4: Java Tree structure interview and coding questions
Recursion Vs Tail Recursion
Coding - Data Which & Why
(2)
09: When to use which Java data structure? and why?
9 Java Data structures best practices
Coding - Passing the unit tests
(5)
02: Tree structure - calculate average recursively & iteratively in Java
Prerequisite: if want to work with Maven & eclipse
Processing data from a file & sorting them
Working with a given input string & character processing
Working with monetary values
Coding - What is wrong?
(10)
01: What is wrong with following Java code snippets? Auto-unboxing, switch, short circuit & exception
03: What is wrong with this code? Data types & equals( ) Vs, hashCode( ) contract
04: What is wrong with this code? Java Collection & ConcurrentModificationException
05: What is wrong with this code? Deep Vs Shallow comparison & multithreading
06: What is Wrong with this code? Multithreading & wait/notify
07: What is wrong with this code? Multithreading & locks
08: What is wrong with this code? Generics
09: What is wrong with this code? HashMap & Race condition
10: What is wrong with this code? ConcurrentHashMap & Atomic operations
What is wrong with this Java code? Heap Vs Stack, Thread safety & Synchronized
Coding - Home Assignments
(8)
1. Set up environment for home coding assignments
2. Implement an in-memory LRU cache in Java with TTL
3. Multi-Threading - Create a simple framework where work items can be submitted
4a. 10-digit phone number to produce a list of words matching first letters of the phone number
4b. FP approach 10-digit phone number to produce a list of words matching first letters of the phone number
5a - Writing a simple SQL where clause parser in Java - Part 1
5b - Writing a simple SQL where clause parser in Java - Part 2
Simple caching Java application step by step
Coding - Written Test Core Java
(4)
04: 7 Java Collection Quizzes
Q01-Q07 written test questions and answers on core Java
Q08-Q15 written test questions and answers on core Java
Q16-Q24 written test questions and answers on core Java
Coding - Written Test JEE
(1)
10 Java web services written test questions and answers

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